I think that it isn't unusual in Italy for people to refer to popes using their surname instead of the papal name. I have seen that in lots of articles where there was no hint of disrespect although I'm not so sure how common it is to omit the title. I'm inclined to cut the Archbishop some slack. All Bishops have a duty to defend the Faith. I'm not sure, but they probably take an oath to that effect. For all we know, from his point of view, he could be breaking one oath in order to be true to another oath. Seems to me that he's an honest man desperately trying to save the Church from being taken over by her enemies. He could be wrong about that but if he is right, he could be following his conscience. Pope Francis would look like a real idiot were he to denounce someone for following their conscience considering how he is only short of using conscience to tell people that they are their own magisterium.